Cancer is most likely to develop when a mutation takes place in a somatic cell of an organism.
a DNA mutation that happens after conception. All body cells, excluding the germ cells (sperm and egg), are susceptible to somatic mutations, which are not passed on to offspring. These changes may, but are not always, the root of cancer or other illnesses.
After fertilization, each cell in a person's body that isn't an egg or sperm experiences a somatic mutation, which alters their DNA (germ cells). Human cells replicate and replace one another constantly.
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